After a night out in Maastricht with her friends, a woman from Amsterdam is found dead in the Maas River. None of her friends have any idea what happened to her. Wolfs and Eva investigate the woman's movements. The only clue seems to be a brief encounter she had with a man on a terrace on the Vrijthof, after which the man quickly disappeared. Wolfs and Eva discover who the man is. But why was he startled by the victim if he didn't know her? Wolfs wants to talk to Frank about what happened between him and Eva. But that conversation turns out very differently than he expected. And Marion is in for an unpleasant surprise when her husband visits her at work.